How Geckos Stick to Glass—and Let Go

A Tokay gecko can grip glass. A leopard gecko has no adhesive toe pads. What makes their feet so different—and how does a gripping gecko let go? Explore the tiny branching structures beneath gecko toes, the molecular forces behind their grip, and the way movement helps release it. Then compare leaf-toed, fan-toed and Moorish gecko feet, see why claws and dusty surfaces matter, and discover how evolution has gained and lost adhesive pads. Subscribe to SSD Simplified Science Documentaries for a closer look at how the natural world works. CHAPTERS 00:00 Two geckos, two ways to grip 00:30 What is underneath a gecko toe? 01:29 How a gecko lets go 02:26 Different toes, different pads 03:14 Claws, glass and rough surfaces 03:53 When dust gets in the way 04:07 A clue from Giraglia 05:10 The gecko without adhesive pads 05:52 Evolution changes the feet 06:29 Back to the glass RESEARCH Single-hair adhesion — Autumn et al. (2000) https://www.nature.com/articles/35015073 Van der Waals adhesion — Autumn et al. (2002) https://pubmed.ncbi.nlm.nih.gov/12198184/ Frictional adhesion — Autumn et al. (2006) https://pubmed.ncbi.nlm.nih.gov/16943497/ Toe-pad forms — Griffing et al. (2022) https://academic.oup.com/biolinnean/articl... Giraglia field study — Russell & Delaugerre (2017) https://zslpublications.onlinelibrary.wile... Repeated gains and losses — Gamble et al. (2012) https://pubmed.ncbi.nlm.nih.gov/22761794/ Habitat exceptions — Zimin et al. (2025) https://onlinelibrary.wiley.com/doi/10.111... Claws and rough surfaces — Pillai et al. (2020) https://onlinelibrary.wiley.com/doi/full/1... VISUAL CREDITS Gekko gecko in Yogyakarta, 2014-04-25 02.jpg — Crisco 1492 (CC BY-SA 3.0) https://commons.wikimedia.org/wiki/File:Ge... Gecko foot on glass.JPG — Bjørn Christian Tørrissen (CC BY-SA 3.0) https://commons.wikimedia.org/wiki/File:Ge... Close-up of Lizard — Ivonne Arceo (Pexels License) https://www.pexels.com/video/close-up-of-l... Lizard Moving Among Stones — Ivonne Arceo (Pexels License) https://www.pexels.com/video/lizard-moving... Gecko footpads.jpg — Montrealais (CC BY 3.0) https://commons.wikimedia.org/wiki/File:Ge... Tarentola mauritanica downview.jpg — Francois Mignard (CC BY-SA 4.0) https://commons.wikimedia.org/wiki/File:Ta... Benny Trapp Europäischer Blattfinger.jpg — Benny Trapp (CC BY 3.0) https://commons.wikimedia.org/wiki/File:Be... Ptyodactylus puiseuxi 12980343.jpg — Julien Renoult (CC BY 4.0) https://commons.wikimedia.org/wiki/File:Pt... Giraglia-ile-1.jpg — Pierre Bona (CC BY-SA 3.0) https://commons.wikimedia.org/wiki/File:Gi... Euleptes europaea 4729841.jpg — Julien Renoult (CC BY 4.0) https://commons.wikimedia.org/wiki/File:Eu... Source photographs and footage were cropped, scaled and upscaled; some footage also supplies still images. Adapted CC BY-SA photographs retain their respective source licences. Licence links: CC BY-SA 3.0: https://creativecommons.org/licenses/by-sa... Pexels License: https://www.pexels.com/license/ CC BY 3.0: https://creativecommons.org/licenses/by/3.0/ CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa... CC BY 4.0: https://creativecommons.org/licenses/by/4.0/ Some microscopic and surface visuals are AI-assisted illustrations, not recorded experiments or microscopy. Animal photographs and footage are credited above. #geckos #sciencedocumentary #sciencedocumentary #biology